MongoDB的删除操作

2.删除集合   集合删除语法格式如下：
  db.collection.drop()

<span style="color: #808080;">></span> <span style="color: #0000ff;">use</span><span style="color: #000000;"> test
switched </span><span style="color: #0000ff;">to</span><span style="color: #000000;"> db test
</span><span style="color: #808080;">></span><span style="color: #000000;"> db
test
</span><span style="color: #808080;">></span><span style="color: #000000;"> show tables
firstCollection
user_info
</span><span style="color: #808080;">></span> db.firstCollection.<span style="color: #0000ff;">drop</span><span style="color: #000000;">()
true
</span><span style="color: #808080;">></span><span style="color: #000000;"> show tables
user_info</span>

3.删除文档数据

db.collection.remove(
   <query>,
   {
     justOne: <boolean>,
     writeConcern: <document>
   }
)

参数说明：
query :（可选）删除的文档的条件。
justOne : （可选）如果设为 true 或 1，则只删除一个文档，如果不设置该参数，或使用默认值 false，则删除所有匹配条件的文档。
writeConcern :（可选）抛出异常的级别。

<span style="color: #808080;">></span><span style="color: #000000;"> show tables
user_info
</span><span style="color: #808080;">></span><span style="color: #000000;"> db.user_info.find()
{ "_id" : ObjectId("5de47393fc0c5f2c5c98a979"), "name" : "zhangsan", "age" : "</span><span style="color: #800000; font-weight: bold;">23</span><span style="color: #000000;">", "adrss" : "zhenzhou" }
</span><span style="color: #808080;">></span> 
<span style="color: #808080;">></span> db.user_info.<span style="color: #0000ff;">insert</span>({name:<span style="color: #ff0000;">‘</span><span style="color: #ff0000;">wangwu</span><span style="color: #ff0000;">‘</span>,age:<span style="color: #ff0000;">‘</span><span style="color: #ff0000;">12</span><span style="color: #ff0000;">‘</span>,adress:<span style="color: #ff0000;">‘</span><span style="color: #ff0000;">shanghai</span><span style="color: #ff0000;">‘</span><span style="color: #000000;">})
WriteResult({ "nInserted" : </span><span style="color: #800000; font-weight: bold;">1</span><span style="color: #000000;"> })
</span><span style="color: #808080;">></span><span style="color: #000000;"> db.user_info.find()
{ "_id" : ObjectId("5de47393fc0c5f2c5c98a979"), "name" : "zhangsan", "age" : "</span><span style="color: #800000; font-weight: bold;">23</span><span style="color: #000000;">", "adrss" : "zhenzhou" }
{ "_id" : ObjectId("5de481d56829d245aa1eb137"), "name" : "wangwu", "age" : "</span><span style="color: #800000; font-weight: bold;">12</span><span style="color: #000000;">", "adress" : "shanghai" }
</span><span style="color: #808080;">></span> db.user_info.remove({name:<span style="color: #ff0000;">‘</span><span style="color: #ff0000;">zhangsan</span><span style="color: #ff0000;">‘</span><span style="color: #000000;">})
WriteResult({ "nRemoved" : </span><span style="color: #800000; font-weight: bold;">1</span><span style="color: #000000;"> })
</span><span style="color: #808080;">></span><span style="color: #000000;"> db.user_info.find()
{ "_id" : ObjectId("5de481d56829d245aa1eb137"), "name" : "wangwu", "age" : "</span><span style="color: #800000; font-weight: bold;">12</span>", "adress" : "shanghai" }

想删除所有数据，可以使用以下方式（类似常规 SQL 的 truncate 命令）
db.user_info.remove({})
db.user_info.find()

MongoDB的删除操作

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